On 03/02/2013 06:33 AM, Hugh Dickins wrote:
On Fri, 1 Mar 2013, Simon Jeons wrote:
On 03/01/2013 05:22 PM, Simon Jeons wrote:
On 02/23/2013 01:56 AM, Johannes Weiner wrote:
Mapped file pages have to get scanned twice before they are reclaimed
because we don't have enough usage information after the first scan.
It seems that just VM_EXEC mapped file pages are protected.
Issue in page reclaim subsystem:
static inline int page_is_file_cache(struct page *page)
{
return !PageSwapBacked(page);
}
AFAIK, PG_swapbacked is set if anonymous page added to swap cache, and be
cleaned if removed from swap cache. So anonymous pages which are reclaimed
and add to swap cache won't have this flag, then they will be treated as
s/are/aren't
PG_swapbacked != PG_swapcache
Oh, I see. Thanks Hugh, thanks for your patient. :)
In function __add_to_swap_cache if add to radix tree successfully will
result in increase NR_FILE_PAGES, why? This is anonymous page instead of
file backed page.
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